[sahy-fuh-nuh-fawr, -fohr, sahy-fon-uh-]
any pelagic hydrozoan of the order Siphonophora, being a floating or swimming colony composed of polyps.

1835–45; < Neo-Latin Siphonophora name of the order < Greek siphōnophór(os) tube-carrying (equivalent to siphōno- siphono- + -phóros -phore) + -a neuter plural noun suffix

siphonophorous [sahy-fuh-nof-er-uhs] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
siphonophore (ˈsaɪfənəˌfɔː, saɪˈfɒnə-)
any marine colonial hydrozoan of the order Siphonophora, including the Portuguese man-of-war
[C19: from New Latin siphonophora, from Greek siphōnophoros tube-bearing]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
siphonophore   (sī-fŏn'ə-fôr', sī'fə-nə-)  Pronunciation Key 
Any of various transparent, often subtly colored marine cnidarians of the order Siphonophora, consisting of a delicate floating or swimming colony of polyplike and medusalike individuals. Siphonophores can reach lengths of 40 m (131 ft), making them longer than blue whales. The Portuguese man-of-war is a siphonophore.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The siphonophore kept going and going, nothing but stomachs and tentacles.
One of the many interesting creatures that have been observed is the siphonophore, pictured here.
One such example is a small siphonophore, which spends its entire life as plankton.
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